Radioreceiving loud speaker



Sept. 29, 1931. w. H. HU TH ET AL RADIORECEIVING LOUD SPEAKER Criginal Filed Oct 9, 1928 I Paton ted I 29, 1931" UNITED STATES PATENT orrlce WALTER H. HUTK AND BYRON B. IINNIUI, OF CHICAGO, ILLINOIS, ASSIGNOBS TO EIOBY & CLARK RADIO CORP OI CHICAGO, ILLINOIS, A CORPORATION 01 DELA- WARE ' mm'onncmvme Loni) srmm Original application filed October-'8, 1928, Serial 110. 811,899. Divided-and this application filled September 15, 1930. Serial No. 481,882.

This invention relates to radio loud speakers, and more articularly to electrostatic reproducers. T is, therefore,-is 'a division of our prior application, Serial No. 311,399,

5 filed October 9, 1928.

Generally stated, the object of the inven tion, covered by this divisional application, is to provide a novel and improved construction whereby a vibratory member is supported in electrostatic relation to a stationary member,'with a plurality of yielding supports interposed between the two members, distributed over the opposing surfaces thereof, whereby the vibratory member is normally held a distance from the opposing surface of the stationary member, but may vibrate freely when included in a radio or other reproducing circuit.

It is also an object to provide certain details and features of construction. and combinations tending to increase the general efficiency and the'de'sirability of a'reproducer or loud speaker of this particular character.

To these andother usefulends, the invention consists in matters hereinafter set forth and claimed and shown in the accompanying drawings, in-which- Fig. 1 is a front or face view of a radio loud speaker or static reproducer embodying the principles of the invention;

Fig. 2 is a section on line 2-2 in Fig. 1;

Fig. 3 is a fragmentary enlarged section on line 3-3 of Fig. 1.

As thus illustrated, the invention comprises a stationary member or solid plate 1, having openings or perforations 2 therein. The outer surface of this plate is insulated at 3 in any suitable or desired manner, providing a dielectric surface. This plate has a central support 4 b which it may be advantageously supporte desired position. v

The vibratory metal plate 5 is spaced a distance from. the dielectric surface. by the springs 6, formed of struck-out portions of said vibratory plate, bent toward the stationary plate, so, that the ends of these springs or resilient supports engage and 50 bear upon the dielectric surface. In-this fromthe member 1, the en preferably in any.

' device is included or flow of the air during way, the vibratory diaphragm or member 5 1s provided with openings 7 therein, as shown.

The diaphragm 5 is held at its periphery by a mug 8, which' in turn is mounted on springs 9 carried by the stationary member 1, previously mentioned, whereby the ripheries of the member 1 and the .d1aphragm 5 are substantially close together.

In this way, capacity is "formed, substantially like an ordinary condenser, and when the member 1 and the diaphragm 5 are connected in series in a reproduc ng circuit, the charging action of the capacity will cause the desired vibration of the diaphragm 5, audibly, thereby providing a radio or other loud speaker operating on the electrostatic principle.

The springs 6 can be under some tension, so that when the diaphragm 5 moves away s of these springs will not be disengaged from the dielectric surface. P

If necessary or desirable, the diaphragm 5 can be polarized. y includin it in a polarizing circuit (not shown) 0 any suitable character, so that the diaphragm will be under tension other than that caused by the reproducing circuit currents. In this way, stationary and vibratory members are held in spaced relation, forming, in effect, a condenser or capacity, with yielding or resilient supports or' spacing means interposed between said members, and are distributed over the opposing surfaces of said members, of such character as to maintain the desired separation between the two members, but without interfering with the free vibration of one member relatively to the other, b the char ing and discharging action 0 the con enserlike structure or capacity thus formed, when the in a reproducing circuit. The vibratory member 5 may be of any suitable flexible or resilient metal, or combination of metal and" other materials. Regardless of the materials employed, however, it will be seen that the openings 2, and also the openings 7 provide for free circulation the time that the. 100

. tem er, 1930.

vibratory member 5 is in action, so that the air will not interfere with such vibratory action.

What we claim as our invention is:

1. An electrostatic reproducer comprising a stationary member and a vibratory member disposed a distance apart, with a plurality of yielding and resilient supports interposed between the two members, distributed over the opposing surfaces thereof said members being adapted to be include in series in a reproducing circuit to cause audible action thereof by the vibration of said vibratory member.

2. A structure as specified in claim 1, said supports being integral with said vibratory member.

3. A structure as specified in claim 1, said vibratory member having an opening therein adjacent to each of said supports.

4. A structure as specified in claim 1, said vibratory member comprising a resilient metal plate having springs formed integrally therewith, forming said supports.

5. An electrostatic reproducer comprising means formin capacity having a resiliently supported and vlbratory element adapted and operative to be vibrated audibly without rattling contact at intermediate rigid supportin points with any arts of the structure by the charging an dischar ing I action of said capacity when connecte in the reproducin circult, comprisin a stationary or fixer? plate, and a mova e plate forming said vibratory element, the movable late having yieldin spring support on the xed or stationary p ate, the spring support comprising a lurality of springs formed by metal struc out from the movable plate to provide perforations in the movable plate. 6. An electrostatic reproducer comprising means forming capacity having a vibratory element adapted and operative to be v1- brated audibly by the charging and dischargng action of said capacity when connected in the reproducing circuit, comprisin a stationary or fixed plate, and a movab e plate forming sai'd vibratory element, the movable plate having yieldin spring support on the fixed or stationary late, the spririg support comprising a plurality of springs orme by metal struck out from the movable plate to provide erforations in the movable plate.

S eci cation signed this 3rd day of Sep- WALTER H. HUTH. BYRON B. MINNIUM. 

